A prestressed composite beam structure and its installation method

Abstract

This application discloses a prestressed composite beam structure and installation method, relating to the field of bridge construction technology. The application includes a bridge concrete abutment, with multiple top beams uniformly fixedly connected to the bottom of the concrete abutment. Support columns are symmetrically fixedly connected to the bottom of the top beams, and triangular trusses are fixedly connected to opposite sides of adjacent support columns. A prestressed concrete abutment is erected on top of the triangular trusses. When the load received by the bridge concrete abutment is transferred to the prestressed concrete abutment using the top beams and diagonal bracing steel beams, the tensioning of the prestressing tendons offsets part of the load borne by the prestressed concrete abutment. Simultaneously, the force-bearing rod drives the support plate, converting part of the load borne by the support beam into a contact force between the support plate and the prestressed concrete abutment. This facilitates the effective distribution of externally applied loads to the support columns, prestressing tendons, and support plate for bearing, effectively improving the load-bearing stability of the device.

Description

Technical Field

[0001] This application relates to the field of bridge construction technology, and in particular to a prestressed composite beam structure and its installation method. Background Technology

[0002] In the fields of building and bridge engineering, prestressed technology, as a key engineering technique, has long been regarded as an important means to improve structural performance. This technology, by pre-applying tensile stress within structural members, balances some or all of the tensile stress caused by external loads, greatly enhancing the load-bearing capacity and stability of the structure. Among them, prestressed composite beams, as a highly efficient structural form, have been widely used due to their superior mechanical properties and economic efficiency.

[0003] The design principle of prestressed composite beams is to effectively combine prestressing tendons with the concrete beam body. Through the tensioning effect of the prestressing tendons, a prestressing stress field is formed inside the beam body. This prestressing stress field can significantly improve the crack resistance and stiffness of the beam body, thereby enhancing the load-bearing capacity and stability of the entire structure.

[0004] Traditional prestressed composite beams are typically constructed by pre-drilling ducts inside the beam structure, then threading prestressing tendons through these ducts for tensioning and anchoring. Because the prestressing tendons pass directly through the beam, they are prone to displacement or slippage when subjected to external forces such as vibration or strong winds, thus affecting the overall stability of the structure. Summary of the Invention

[0005] The purpose of this application is to address the problem that, due to the prestressing tendons directly passing through the beam, the prestressing tendons are prone to displacement or sliding when the beam is subjected to external forces such as vibration or strong winds, thus affecting the stability of the entire structure. This application provides a prestressed composite beam structure and its installation method.

[0006] To achieve the above objectives, this application specifically adopts the following technical solution:

[0007] A prestressed composite beam structure includes a bridge concrete abutment. Multiple top beams are uniformly fixedly connected to the bottom of the concrete abutment. Support columns are symmetrically fixedly connected to the bottom of each top beam. Triangular trusses are fixedly connected to opposite sides of each pair of adjacent support columns. A prestressed concrete abutment is supported on top of each triangular truss. Multiple prestressed tendons are uniformly arranged inside the prestressed concrete abutment. Diagonal steel beams are symmetrically fixedly connected to the bottom of each top beam. The bottom end of each diagonal steel beam is fixedly connected to the prestressed concrete abutment. A support beam is provided between adjacent support columns. The support beam is installed below the prestressed concrete abutment. One end of the support beam has a lifting slot, and a force-bearing rod is inserted into the lifting slot. The top of the force-bearing rod abuts against the prestressed concrete abutment. A support plate is symmetrically installed on one end of the support beam, and a transmission mechanism for driving the support plate to abut against the prestressed concrete abutment is symmetrically installed on one end of the support beam. A locking assembly for fixing the triangular trusses and the support beam is installed on one end of each support column.

[0008] By adopting the above technical solution, and by setting up the locking component and the transmission mechanism in cooperation, it is convenient to transfer the load received by the bridge concrete abutment to the prestressed concrete abutment when the load is transferred by the top beam and the diagonal bracing steel beam. At the same time, the tensioning of the prestressed tendons offsets part of the load borne by the prestressed concrete abutment. Simultaneously, the force-bearing rod drives the support plate to convert part of the load borne by the support beam into the contact force between the support plate and the prestressed concrete abutment. This facilitates the effective distribution of the externally applied load to the support column, prestressed tendons, and support plate for bearing, and effectively improves the bearing stability of the device.

[0009] Furthermore, the transmission mechanism includes a pair of guide slide rods symmetrically fixedly connected to one end of the support beam. One end of each pair of adjacent guide slide rods is fixedly connected to a connecting plate. One end of each guide slide rod is slidably connected to a transmission slide plate. One end of the force-bearing rod is symmetrically hinged to a first transmission rod. The other end of the first transmission rod is hinged to the transmission slide plate. The top of the transmission slide plate is hinged to a second transmission rod. The middle section of the second transmission rod is hinged to a third transmission rod. One end of the third transmission rod is hinged to the connecting plate. The top of the second transmission rod is hinged to the support plate. One end of the connecting plate is equipped with a guide assembly for guiding the support plate to move along the length direction of the force-bearing rod. Another end of the connecting plate is equipped with a follower assembly for guiding the support plate to move along the length direction of the guide slide rod.

[0010] By adopting the above technical solution, and by setting up the guiding component and the follower component in combination, when the prestressed concrete foundation transfers the load it receives to the load-bearing rod, the load-bearing rod drives the two transmission rods one around the hinge axis to push the transmission rod two to drive the transmission slide plate to move along the length direction of the guiding rod. In conjunction with the transmission rod three, the support plate pushes the support plate upward along the length direction of the load-bearing rod to abut against the prestressed concrete foundation. This allows the load-bearing rod to convert part of the load received by the prestressed concrete foundation into the abutment support force of the support plate against the prestressed concrete foundation, thereby weakening part of the load on the prestressed concrete foundation and further improving the stability of the device.

[0011] Furthermore, the guiding assembly includes a guiding block disposed on one side of the connecting plate, one end of the guiding block having a guiding hole, a guide rod being slidably inserted into the guiding hole, and the top of the guide rod being fixedly connected to the support plate.

[0012] By adopting the above technical solution, and by setting up the guide hole and the guide slide rod in combination, when the drive transmission rod pushes out of the support plate around the hinge shaft and forms an abutment with the prestressed concrete base, the support plate drives the guide slide rod through the guide hole and guides the support plate to move along the length direction of the guide slide rod, thereby further improving the stability of the device.

[0013] Furthermore, the follower component includes a follower groove formed at one end of the connecting plate, and a follower slider adapted to the follower groove is symmetrically fixedly connected to one end of the guide block.

[0014] By adopting the above technical solution, and by setting up the cooperation between the follower slide and the follower slider, it is convenient for the pallet to drive the guide slide to push the follower slider along the length direction of the follower slide when the drive transmission rod pushes the pallet out around the hinge shaft, thereby effectively improving the smoothness of the device.

[0015] Furthermore, a lifting spring is sleeved around the guide slide rod, and the lifting spring is installed between the connecting plate and the transmission slide plate.

[0016] By adopting the above technical solution, and by setting up the lifting spring in conjunction with the connecting plate and the transmission slide plate, it is convenient to use the rebound characteristics of the lifting spring to push the transmission slide plate away from the connecting plate, and to drive the top of the force rod to make contact with the bottom of the prestressed concrete base, thereby improving the practicality of the device.

[0017] Furthermore, the locking assembly includes a plurality of adjusting holes evenly opened at one end of the support column, a pair of locking holes I adapted to the adjusting holes are opened at one end of the tripod, a pair of locking holes II adapted to the adjusting holes are symmetrically opened at one end of the support beam, a locking screw is inserted into the adjusting hole, one end of the locking screw passes through the adjusting hole and the locking hole I or the locking hole II, and is threadedly connected to a locking nut.

[0018] By adopting the above technical solution, and by setting the adjustment hole and locking hole one, locking hole two, locking screw, and locking nut in combination, it is convenient to use the traction tripod or support beam to align locking hole one or locking hole two with the corresponding adjustment hole according to the actual situation. Then, with the locking screw and locking nut, the support column and the tripod or support beam can be quickly and securely connected, which effectively improves the applicability and practicality of the device.

[0019] Furthermore, the surfaces of the top beam, supporting column, diagonal bracing steel beam, and purlin are all coated with silicone waterproof coating.

[0020] By adopting the above technical solution and applying an organosilicon waterproof coating, the corrosion resistance of the device is effectively improved, and the service life of the device is extended.

[0021] An installation method for a prestressed composite beam structure includes:

[0022] S1: First, support columns are fixed on the foundation, and top beams are fixed on the top of the support columns using bolts and other parts. Then, the concrete abutment of the bridge is constructed using the top beams as fulcrums.

[0023] S2: Then, the triangular truss is fixedly connected on the opposite side of the two adjacent support columns using a locking assembly, and a prestressed concrete base is erected on the top of the triangular truss. At the same time, multiple prestressed tendons for applying prestress are set inside the prestressed concrete base.

[0024] S3: Next, symmetrically fix the diagonal bracing steel beams at the bottom of the top beam, so that the bottom of the diagonal bracing steel beams forms a fixed contact with the prestressed concrete base.

[0025] S4: Then, the locking assembly is used to fix the support beam between two adjacent support columns, so that the support beam drives the load-bearing rod to form an abutment with the prestressed concrete base. At the same time, when the load-bearing rod is subjected to the abutment force of the prestressed concrete base, it cooperates with the transmission mechanism to drive the support plate to form an abutment with the prestressed concrete base.

[0026] In summary, this application includes at least one of the following beneficial effects:

[0027] 1. By setting up a locking component and a transmission mechanism for coordinated use, when the load received by the bridge concrete abutment is transferred to the prestressed concrete abutment using the top beam and diagonal bracing steel beam, the tensioning of the prestressed tendons can offset part of the load borne by the prestressed concrete abutment. At the same time, the force-bearing rod drives the support plate to convert part of the load borne by the support beam into the contact force between the support plate and the prestressed concrete abutment. This facilitates the effective distribution of the externally applied load to the support columns, prestressed tendons, and support plate for bearing, effectively improving the load-bearing stability of the device.

[0028] 2. By using the guide component and the follower component in combination, when the prestressed concrete foundation transfers the load to the load-bearing rod, the load-bearing rod drives two transmission rods around the hinge axis to push transmission rod two to move the transmission slide along the length of the guide rod. In conjunction with transmission rod three, the support plate pushes upward along the length of the load-bearing rod to contact the prestressed concrete foundation. This allows the load-bearing rod to convert part of the load received by the prestressed concrete foundation into the contact support force of the support plate on the prestressed concrete foundation, thereby weakening part of the load on the prestressed concrete foundation and further improving the stability of the device.

[0029] 3. By setting up adjustment holes and locking holes one and two, locking screws, and locking nuts for coordinated use, it is easy to align locking holes one or two with the corresponding adjustment holes by pulling the tripod or support beam according to the actual situation. Then, with the help of locking screws and locking nuts, the support column, tripod, and support beam can be quickly and securely connected, effectively improving the applicability and practicality of the device. Attached Figure Description

[0030] Figure 1 This is a three-dimensional structural diagram of the main body of the device in this application.

[0031] Figure 2 This is a schematic diagram of the connection structure between the support column and the tripod in this application.

[0032] Figure 3 This is a schematic diagram of the top structure of the support beam in this application.

[0033] Figure 4 This is a schematic diagram of the internal structure of the follower slide in this application.

[0034] Explanation of reference numerals in the attached figures:

[0035] 1. Bridge concrete abutment; 2. Top beam; 3. Support column; 4. Triangular truss; 5. Prestressed concrete abutment; 6. Prestressed tendon; 7. Diagonal bracing steel beam; 8. Support beam; 9. Lifting slot; 10. Load-bearing rod; 11. Support plate; 12. Guide slide rod; 13. Connecting plate; 14. Transmission slide plate; 15. Transmission rod one; 16. Transmission rod two; 17. Transmission rod three; 18. Guide block; 19. Guide through hole; 20. Guide slide rod; 21. Follower slide groove; 22. Follower slider; 23. Lifting spring; 24. Adjustment hole; 25. Locking hole one; 26. Locking hole two; 27. Locking screw; 28. Locking nut. Detailed Implementation

[0036] The following is in conjunction with the appendix Figure 1-4 This application will be described in further detail.

[0037] This application discloses a prestressed composite beam structure and its installation method.

[0038] Reference Figures 1-3 A prestressed composite beam structure includes a bridge concrete abutment 1. Multiple top beams 2 are uniformly fixedly connected to the bottom of the bridge concrete abutment 1. Support columns 3 are symmetrically fixedly connected to the bottom of the top beams 2. Triangular trusses 4 are fixedly connected to opposite sides of adjacent support columns 3. A prestressed concrete abutment 5 is erected on top of the triangular trusses 4. Multiple prestressed tendons 6 are uniformly arranged inside the prestressed concrete abutment 5. Diagonal bracing beams 7 are symmetrically fixedly connected to the bottom of the top beams 2, and the bottom ends of the diagonal bracing beams 7 are fixedly connected to the prestressed concrete abutment 5. A support beam 8 is provided between two adjacent support columns 3. The support beam 8 is installed below the prestressed concrete base 5. A lifting slot 9 is provided at one end of the support beam 8. A force-bearing rod 10 is inserted into the lifting slot 9. The top of the force-bearing rod 10 abuts against the prestressed concrete base 5. A support plate 11 is symmetrically installed at one end of the support beam 8. A transmission mechanism for driving the support plate 11 to abut against the prestressed concrete base 5 is also symmetrically installed at one end of the support beam 8. A locking assembly for fixing the triangular platform 4 and the support beam 8 is installed at one end of the support column 3.

[0039] In use, the prestressing is first applied to the prestressed tendons 6 that are evenly arranged inside the prestressed concrete abutment 5 using tensioning equipment. Then, the load borne by the bridge concrete abutment 1 is distributed and transferred to the top of the prestressed concrete abutment 5 using the inclined steel beam 7. At the same time, the tensioning of the prestressed tendons 6 generates a reaction force with the pressure on the top of the prestressed concrete abutment 5, which offsets part of the load on the prestressed concrete abutment 5, thereby enhancing the load-bearing capacity and crack resistance of the prestressed concrete abutment 5.

[0040] Furthermore, while the top beam 2 transfers the load to the prestressed concrete abutment 5, the bottom end of the prestressed concrete abutment 5 comes into contact with the force-bearing rod 10, and the force-bearing rod 10 drives the support plate 11 to come into contact with the bottom of the prestressed concrete abutment 5. This facilitates the conversion of part of the load transferred from the prestressed concrete abutment 5 to the force-bearing rod 10 into the contact force between the support plate 11 and the prestressed concrete abutment 5, further improving the load-bearing capacity and stability of the prestressed concrete abutment 5. This makes it easier to effectively distribute the externally applied load to the support column 3, the prestressed tendon 6, and the support plate 11 when external loads are applied to the bridge concrete abutment 1, by using the combined use of the diagonal bracing steel beam 7, the support beam 8, the force-bearing rod 10, and the support plate 11 for bearing, effectively improving the load-bearing stability of the device.

[0041] Reference Figures 2-4 The transmission mechanism includes a pair of guide slide rods 12 symmetrically fixedly connected to one end of the support beam 8. A connecting plate 13 is fixedly connected to one end of the two adjacent guide slide rods 12. A transmission slide plate 14 is slidably connected to one end of the guide slide rod 12. A transmission rod 15 is symmetrically hinged to one end of the force rod 10. The other end of the transmission rod 15 is hinged to the transmission slide plate 14. A transmission rod 2 16 is hinged to the top of the transmission slide plate 14. A transmission rod 3 17 is hinged to the middle section of the transmission rod 2 16. One end of the transmission rod 3 17 is hinged to the connecting plate 13. The top of the transmission rod 2 16 is hinged to the support plate 11. A guide component for guiding the support plate 11 to move along the length direction of the force rod 10 is installed at one end of the connecting plate 13. A follower component for guiding the support plate 11 to move along the length direction of the guide slide rod 12 is installed at one end of the connecting plate 13.

[0042] The guiding component includes a guide block 18 disposed on one side of the connecting plate 13. One end of the guide block 18 has a guide hole 19. A guide rod 20 is slidably inserted into the guide hole 19. The top of the guide rod 20 is fixedly connected to the support plate 11.

[0043] Furthermore, the follower component includes a follower slide groove 21 opened at one end of the connecting plate 13, and a follower slider 22 adapted to the follower slide groove 21 is symmetrically fixedly connected to one end of the guide block 18.

[0044] In use, the locking assembly first fixes the support beam 8 between two adjacent support columns 3, and drives the force rod 10 to abut against the bottom of the prestressed concrete base 5. When the prestressed concrete base 5 is subjected to the load transmitted by the inclined steel beam 7, the prestressed concrete base 5 pushes the force rod 10 downward along the length of the lifting slot 9. At the same time, the force rod 10 drives the two transmission rods 15 to move away from each other around the hinge axis, and pushes the transmission slide plate 14 to drive the transmission rod 16 to move along the length of the guide slide rod 12. At the same time, the transmission rod 16 drives the transmission rod 17 to push the support plate 11 upward around the hinge axis along the length of the guide slide rod 20, and drives the support plate 11 to abut against the bottom of the prestressed concrete base 5. Thus, the force rod 10 converts part of the load received by the prestressed concrete base 5 into the abutment support force of the support plate 11 on the prestressed concrete base 5, thereby weakening part of the load on the prestressed concrete base 5 and further improving the stability of the device.

[0045] Furthermore, while the drive transmission rod 16 pushes the support plate 11 upward around the hinge axis, the support plate 11 drives the guide slide rod 20 to slide inside the guide hole 19, thereby guiding the support plate 11 to move along the length direction of the guide slide rod 20. At the same time, when the support plate 11 is pushed out by the drive transmission rod 16 around the hinge axis, it will also push the guide slide rod 20 to drive the guide block 18 to drive the follower slider 22 to move along the length direction of the follower slide groove 21, thereby ensuring the smoothness and stability of the movement of the support plate 11.

[0046] Reference Figures 2-4 A lifting spring 23 is sleeved around the guide slide rod 12, and the lifting spring 23 is installed between the connecting plate 13 and the transmission slide plate 14.

[0047] In use, the lifting spring 23 rebounds along the length of the guide slide 12 to push out the transmission slide plate 14, and the transmission slide plate 14 drives the transmission rod 15 to push out the force rod 10 around the hinge shaft. At the same time, the force rod 10 is pushed along the length of the lifting slot 9 to form an abutment with the prestressed concrete base 5, thereby effectively improving the practicality of the device.

[0048] Reference Figure 1 and Figure 2 The locking assembly includes multiple adjusting holes 24 evenly distributed at one end of the support column 3. One end of the triangular truss 4 is provided with a pair of locking holes 25 that are adapted to the adjusting holes 24. One end of the support beam 8 is provided with a pair of locking holes 26 that are adapted to the adjusting holes 24. A locking screw 27 is inserted into the adjusting hole 24. One end of the locking screw 27 passes through the adjusting hole 24 and the locking hole 25 or the locking hole 26, and is threadedly connected to a locking nut 28.

[0049] In use, firstly, the tripod 4 is moved to a suitable position along the length of the support column 3 by pulling it, and the locking hole 25 is aligned with the corresponding adjustment hole 24. Then, one end of the locking screw 27 is pulled through the adjustment hole 24 and the locking hole 25, and the locking nut 28 is tightened so that the locking nut 28 is locked and fixed to the support column 3 along the length of the locking screw 27, thereby realizing the fixed connection between the tripod 4 and the support column 3.

[0050] Then, by pulling the support beam 8, the locking hole 26 is aligned with the corresponding adjustment hole 24 along the length of the support column 3, and the force rod 10 is brought into contact with the bottom of the prestressed concrete base 5. Then, one end of the locking screw 27 is pulled through the adjustment hole 24 and the locking hole 26, and the locking nut 28 is tightened so that the locking nut 28 is locked and fixed with the support column 3 along the length of the locking screw 27, thereby realizing the fixed connection between the support beam 8 and the support column 3.

[0051] This facilitates the rapid and fixed connection of the support column 3 with the triangular platform 4 and the supporting beam 8 along the length of the support column 3 according to the actual situation, effectively improving the applicability and practicality of the device.

[0052] Reference Figure 1 and Figure 2 The surfaces of the top beam 2, the supporting column 3, the diagonal steel beam 7, and the support beam 8 are all coated with silicone waterproof coating.

[0053] During use, by coating the surfaces of the top beam 2, support column 3, diagonal steel beam 7, and support beam 8 with silicone waterproof coating, an anti-corrosion coating is formed on the surfaces of the top beam 2, support column 3, diagonal steel beam 7, and support beam 8, which effectively reduces the erosion of the surfaces of the top beam 2, support column 3, diagonal steel beam 7, and support beam 8 by rainwater, thereby improving the structural strength and service life of the device.

[0054] An installation method for a prestressed composite beam structure includes:

[0055] S1: First, support columns 3 are fixed on the foundation, and top beam 2 is fixed on the top of support columns 3 using bolts and other parts. Then, the concrete abutment 1 of the bridge is constructed using the top beam 2 as the fulcrum.

[0056] S2: Then, the triangular platform 4 is fixedly connected on the opposite side of the two adjacent support columns 3 using a locking assembly, and a prestressed concrete base 5 is erected on the top of the triangular platform 4. At the same time, multiple prestressed tendons 6 for applying prestress are set inside the prestressed concrete base 5.

[0057] S3: Next, symmetrically fix the diagonal bracing steel beam 7 at the bottom of the top beam 2, so that the bottom of the diagonal bracing steel beam 7 forms a fixed contact with the prestressed concrete base 5.

[0058] S4: Then, the locking assembly is used to fix the support beam 8 between two adjacent support columns 3, so that the support beam 8 drives the force rod 10 to abut against the prestressed concrete base 5. At the same time, when the force rod 10 is subjected to the abutment force of the prestressed concrete base 5, it cooperates with the transmission mechanism to drive the support plate 11 to abut against the prestressed concrete base 5.

[0059] The implementation principle of the prestressed composite beam structure and installation method in this embodiment is as follows: First, the traction tripod 4 is moved to a suitable position along the length of the support column 3, and the locking hole 25 is aligned with the corresponding adjustment hole 24. Then, one end of the traction locking screw 27 is passed through the adjustment hole 24 and the locking hole 25, and the locking nut 28 is tightened so that the locking nut 28 is locked and fixed to the support column 3 along the length of the locking screw 27.

[0060] Then, by pulling the support beam 8, the locking hole 26 is aligned with the corresponding adjustment hole 24 along the length of the support column 3, and the force rod 10 is brought into contact with the bottom of the prestressed concrete base 5. Then, one end of the locking screw 27 is pulled through the adjustment hole 24 and the locking hole 26, and the locking nut 28 is tightened so that the locking nut 28 is locked and fixed with the support column 3 along the length of the locking screw 27.

[0061] Next, the tensioning equipment is used to apply prestress to the multiple prestressed tendons 6 that are evenly arranged inside the prestressed concrete abutment 5. Then, the load borne by the bridge concrete abutment 1 is distributed and transferred to the top of the prestressed concrete abutment 5 by the inclined steel beam 7. At the same time, the tensioning of the prestressed tendons 6 generates a reaction force with the pressure on the top of the prestressed concrete abutment 5, which offsets part of the load on the prestressed concrete abutment 5.

[0062] Furthermore, while the top beam 2 transfers the load to the prestressed concrete base 5, the prestressed concrete base 5 pushes the force rod 10 downward along the length direction of the lifting slot 9. At the same time, the force rod 10 drives the two transmission rods 15 to move away from each other around the hinge axis, and pushes the transmission slide plate 14 to drive the transmission rod 16 to move along the length direction of the guide slide rod 12. Meanwhile, the transmission rod 16 drives the transmission rod 17 to push the support plate 11 upward around the hinge axis along the length direction of the guide slide rod 20, and causes the support plate 11 to come into contact with the bottom of the prestressed concrete base 5.

[0063] At the same time, the support plate 11 drives the guide slide rod 20 to slide inside the guide hole 19, thereby guiding the support plate 11 to move along the length direction of the guide slide rod 20. When the support plate 11 is pushed out by the transmission rod 16 around the hinge shaft, it will also push the guide slide rod 20 to drive the guide block 18 to drive the follower slider 22 to move along the length direction of the follower slide groove 21, thereby ensuring the smoothness and stability of the movement of the support plate 11.

Claims

1. A prestressed composite beam structure comprising a bridge concrete footing (1), characterized in that: The bottom of the bridge concrete foundation (1) is uniformly and fixedly connected with a plurality of top beams (2), the bottom of the top beam (2) is fixedly connected with a support column (3) in symmetry, the opposite side of the adjacent two support columns (3) is fixedly connected with a triangular platform (4), the top of the triangular platform (4) is erected with a prestressed concrete foundation (5), a plurality of prestressed tendons (6) are uniformly arranged in the prestressed concrete foundation (5), the bottom of the top beam (2) is fixedly connected with an inclined bracing steel beam (7) in symmetry, the bottom end of the inclined bracing steel beam (7) is fixedly connected with the prestressed concrete foundation (5), a joist (8) is arranged between the adjacent two support columns (3), the joist (8) is installed below the prestressed concrete foundation (5), a lifting slot (9) is formed in one end of the joist (8), a stress rod (10) is inserted into the lifting slot (9), the top of the stress rod (10) is in abutment with the prestressed concrete foundation (5), a supporting plate (11) is symmetrically installed at one end of the joist (8), and a transmission mechanism for driving the supporting plate (11) to abut against the prestressed concrete foundation (5) is symmetrically installed at one end of the joist (8), and a locking assembly for fixing the triangular platform (4) and the joist (8) is installed at one end of the support column (3); The transmission mechanism comprises a pair of guide sliding rods (12) fixedly connected at one end of the joist (8), a connecting plate (13) fixedly connected at one end of the adjacent two guide sliding rods (12), a transmission sliding plate (14) slidably connected at one end of the guide sliding rod (12), a transmission rod one (15) symmetrically hinged at one end of the stress rod (10), the other end of the transmission rod one (15) hinged with the transmission sliding plate (14), a transmission rod two (16) hinged at the top of the transmission sliding plate (14), a transmission rod three (17) hinged at the middle segment of the transmission rod two (16), one end of the transmission rod three (17) hinged with the connecting plate (13), the top of the transmission rod two (16) hinged with the supporting plate (11), a guide assembly for guiding the supporting plate (11) to move along the length direction of the stress rod (10) is installed at one end of the connecting plate (13), and a follow-up assembly for guiding the supporting plate (11) to move along the length direction of the guide sliding rod (12) is installed at one end of the connecting plate (13); The guide assembly comprises a guide block (18) arranged on one side of the connecting plate (13), a guide hole (19) is formed at one end of the guide block (18), a guide sliding rod (20) is slidably inserted into the guide hole (19), and the top of the guide sliding rod (20) is fixedly connected with the supporting plate (11); The follow-up assembly comprises a follow-up sliding groove (21) formed at one end of the connecting plate (13), and a follow-up sliding block (22) fixedly connected at one end of the guide block (18) and matched with the follow-up sliding groove (21).

2. The pre-stressed composite beam structure of claim 1, wherein: A jacking spring (23) is peripherally sleeved on the guide sliding rod (12), and the jacking spring (23) is installed between the connecting plate (13) and the transmission sliding plate (14).

3. The pre-stressed composite beam structure of claim 2, wherein: The locking assembly comprises a plurality of adjusting holes (24) uniformly arranged at one end of the support column (3), one end of the triangular platform (4) is provided with a pair of locking holes I (25) matched with the adjusting holes (24), one end of the joist (8) is symmetrically provided with a pair of locking holes II (26) matched with the adjusting holes (24), the inside of the adjusting hole (24) is provided with a locking screw (27), one end of the locking screw (27) passes through the adjusting hole (24) and is connected with the locking hole I (25) or the locking hole II (26), and the locking screw (27) is threadedly connected with a locking nut (28).

4. The pre-stressed composite beam structure of claim 3, wherein: The top beam (2), the support column (3), the inclined steel beam (7) and the joist (8) are coated with silicone waterproof paint on surfaces.

5. The method of installing a pre-stressed composite beam structure of claim 4, wherein, Comprise: S1: first, the support column (3) is fixedly arranged on the foundation, and the top beam (2) is fixed on the top of the support column (3) by using bolts and other parts, then the bridge concrete foundation (1) is constructed by taking the top beam (2) as a fulcrum; S2: then, the triangular platform (4) is fixedly connected between the opposite sides of the adjacent two support columns (3) by using the locking assembly, the prestressed concrete foundation (5) is erected on the top of the triangular platform (4), and a plurality of prestressed tendons (6) for applying prestress are arranged in the prestressed concrete foundation (5); S3: then, the inclined steel beam (7) is fixedly connected at the bottom of the top beam (2) in a symmetrical manner, and the bottom of the inclined steel beam (7) is in fixed contact with the prestressed concrete foundation (5); S4: then, the joist (8) is fixedly connected between the adjacent two support columns (3) by using the locking assembly, the joist (8) drives the stress rod (10) to be in contact with the prestressed concrete foundation (5), and the stress rod (10) drives the supporting plate (11) to be in contact with the prestressed concrete foundation (5) when the stress rod (10) is subjected to the contact force of the prestressed concrete foundation (5) in cooperation with the transmission mechanism.

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